DIGESTION AND ABSORPTION 211 authors Lave been collected by Sonntag 150 and Oppel 120a>. The vrttjijorm papilla1 do not differ in any Ape from those in Man. The CGXLCW: ptq^HfTL- take numerous forms, some of which are shown in fig. 87. Those on the base of the tongue are large in the Gorilla, Chimpanzee and all Gibbons except the Siamang : and there are no large conical papillae on the base in Man and the Orang. The lateral urgitn.* take two forms. In the Gorilla and Orang (figs. 37, 39) they appear as rows of laminse and sulci of equal length on the dorsum and lateral borders of the tongue; but they form curved organs, with the convexities inwards, on the lateral borders in the Chimpanzee and Gibbons (figs. 38, 40). The under surface of the tongue is connected to the floor of the mouth by a well-developed frenum linguae. In all Anthropoids'1 except the Orang there is placed astride the frenum a triangular plate or fold of mucous membrane, which Pocock called the " frenal lamella " ; it is usually bifid at the apex, and Wharton's ducts open on the points. In the Orang there are two salivary papillae, instead of a lamella, as in Man. At the sides of the frenum there is a more or less prominent form of mucous membrane, termed the plica jimbriata, which is a vestige of the large plate or inferior tongue (sublingua) of Lemurs. It is present in the adult Gorilla, Chimpanzee and Orang, but it is only found in the foetus in the Gibbons. In Man it is larger at birth, but it diminishes afterwards. * In the tongue of a Siamang Gibbon in the Museum of the Boyal College of Surgeons there is no lamella; but this may be due to defective removal of the tongue from the mouth.